Family name Mantja (Mantja 
) , across the world, is a rare cognomen. The family name Mantja is characteristic of South Africa, where it is a very rare surname, and Indonesia. More frequently, Mantja is the forename as well as the last name.
Miya, Nhlapo, Matseba, Mosikidi, Motaung, Mokoena, Mphuthi, Sehlare, Khumalo, Dlamini, Nyamane, Ndhlovu, Olifant, Mazibuko, Mohlobane, Mosikili, Motloung, Mofokeng, Simelane, Sebiloane, Tsotetsi, Vilakazi, Nkgoese, Motsoeneng, Nyanya, Radebe, Sima, Nale, Nozi, Mollo, Moloi, Mosia, Mbele, Khoza, Nkati, Emely, Martha, Maseko, Maduna, Mabaso, Mohale, Molefe, Modise, Modumo, Selepe, Semela, Kumalo, Lesala, and Tshabalala